Relief device



Oct. l1, 1932. J. A. MAYNARD RELIEF DEVICE Filed Dec. 2s, 1951 mA. d )mi l Patented Oct. 11, 1932 LlNl'iED 15,1; A.I.Ezs

JOSEPH A. MAYNARD, or BosjroN, MASSACHUSETTS PA-TENTFF1C'E 'j r The present invention relates to relief devices especially adapted for use in hot :water systems, such as hot water boilers.

In my prior Patent No. 1,814,722, Vdated 5 July 14, 1931, `a temperature relief' device is described which is constructedl'in such man-V ner as to permit the temperature relief member or fusible element to be readily and easily replaced without dismantling the device and 10 which is simple in construction and inexj y 25 with the accompanying drawing: in which,

Fig. 1 is a fragmentary sectionalv elevational view illustrating the device attached to a boiler; Y I

Figs. 2 and 3 are `sectional views taken 30 upon the lines 2 2 and 3-3 of Fig. l;

Fig.` 4 is a view illustrating one of the removable Vparts of the device; "and A Fig. 5 is a sectional elevational view of the l device with the removable parts omitted.

Before explaining in detail thej present invention, it is to be understood thatthe invention is not limited in its application to the details of construction and arrangement of n parts illustrated in the accompanying dra-w- '40 ings, since the invention is capable of other embodiments and of being practised or carried Vout in various ways. Also it is to be understood that the phraseology or terminology employed herein is for the purposey of '45 ldescription and not ofl'imitation, and it is not intendedv to limit the invention beyond the terms of the severalclaims hereto`ap-- pended as considered in view of the prior art and the requirements thereof.

50 Therelief device herelnshown'for the purpose of illustrating the present preferred form yof the invention vvcomprisesa casingA having one side. wall thereof provided with an extension 6 forming the inlet branch and also provided at right angles thereto withan 55 outlet branch 7. HThe inlet branch 6 is eX#L teriorlyjthreaded to permit the device to be screwed into the boss 4 of a boiler and the outlet'branch 7 is exteriorly threaded so that a suitable drain. pipe 11 maybe connected 60 thereto. The wall of the casing A. opposite the inlet branch 6 is formed with a circular opening 12 having a flat circularface 12a surrounding` the opening. A partition P is formed within the casing A and separates an 65 inlet chamber 3 and an outlet chamber 5; An vopening 30 is provided in the partition P in alinement with the opening 12 and the inlet Vbranch V6. vThe opening 30l is counter-bored and tapped at 9 forthe attachment ofthe 70 removable valvemember B. The side wall of the ,partition P adjacent the opening 30 ismachined to provide a shoulder 10 adjacentthetapped portion r 9. l j e The removable valve. member B' is 'oft75 stepped formation comprising a cylindrical e body portion 13 enlarged to forma wrench receiving headr 14 providing a shoulder 'l5 adapted'to abut the face 12a around the edge y. of the opening 12,'a gasket being 'interposed 89 between the parts, andthe body'13`flttin'g snugly in the opening 12. TheV bod-y 13 jextends through the chamber 5 and is machined to provide a shoulderr 17 abutting the shoulder 10, a gasket being interposedtherebe- S5 tween. The valve v member B also has a threaded portion 18 which screws-into the tapped portion 9 of the opening 30 and permits the removable member B to be adjusted intoproper positioninthecasing. The valve 99 member B is also formed withV a tubular eXf tension 19 of smaller diameter which extends through-'the inlet branch 6 to provide a passagetherebetween andywhich, preferably, eX- Y 1 tends beyond the end of the inlet branch into 95 theboiler." This tubularportion 19 aswell vas the body portion 13 have acommonlaxial passage '20 which terminates at itsv rear Aend at a point'opposite the chamber, a'communi eating passageA 21''being ldrilled at right angles thereto and opening into the chamber 5. The outer end of the tube 19 is tapped at 22 to receive athreaded fusible plug or ele-` exterior threads 23a permitting the plug to be threaded or screwed directly into the tapped end of the tube 19.

A portion of the casing A enclosing .the inlet chamber 3 is provided with an extension Y 31 having a passage 32 which is tapped to' receive a plug 33 having a passage V34: normall closed b a vacuum valve 35 en aofin a seat surrounding the inner end of the passage.' The partition" P is provided with an annular projection 36 extending toward the outlet branch 7. Thel annular extension 36 is provided with a passage 38 providing communication between the inlet chamber 3 and outlet chamber 5 and which is normally closed by a pressure valve 39 held vagainst the seat 3.7 at theouter Vend ofthe extension 36 by a spring 40 extending between the same andan apertured plug 41 threaded in the tapped end of the outlet branch 7. n Y

I claim: Y

1. A relief device comprising a hollow "case ing having an exteriorly threaded extension forming an inlet branch and adapted to be secured tov a boiler, said casing having an outlet branch at right angles to said extension, said inlet and outlet branches being separated by a partition providing an inlet chamber and an outlet chamber, said casing and partition each having an opening oppositesaid inlet branch, a one piece-removable member insertable axially through said openings andinlet branch and secured in one of'saidv openings, said member having meansy for closing theother of said openings and having communicating ducts at right angles to each other connecting the inlet end of said removable member with the outlet chamber, and aA fusible plug closing one of said chiots.

2. A reliefdevice comprising a hollow casing having an exteriorly threaded extension forming an inlet branch and adapted to be secured to aboiler, said casing having an outlet branch atright angles to said extension, said inlet and outlet branches being separated by a partition providing an inlet chamber and anoutletchamber, said casing and partition each having an opening oppositesaid inlet branch, a one piece removable. member-in? Sertable axially through said openings and inlet branch and secured in one of said, openings, saidy member having means -forclosing the other rof said openings and having communicating ducts at right angles to each other connecting the` inlet end of said removable v member with the outlet chambena fusible inlet chamber, and a valve normally closing said last mentioned opening and adapted to open when the pressure in said inlet chamber is less than atmospheric. I

3. A relief device comprising a hollow casing having an exteriorly threaded extension forming an inlet branch and adapted to beV secured "to a boiler, said casing having an outlet branch at right angles to said extension, said inlet and outlet branches being separated 'by a partitionproviding an inlet chamber and an outlet chamber, said casing and 'partition each having an opening opposite said inlet'branch, a one piece removablev member inse'rtable axially through said Openings and inlet branch and secured in one of said openings, said member having means for closing the other ofY saidv openings and having communicating ducts at right angles to each other connecting the inlet end of said removable member with the outletl chamber, a fusible plug closing one of said ducts, said partitionv havingan opening providing communication between said inlet -and outlet chambers, and a valve normally closing said opening and adapted to open in said outlet chamber when lthe, pressure inA said inlet chamber reachesa predetermined amount. d

4. A relief device comprising ahollow cas- Y ing having an exteriorly threaded extension forming anr inlet branch and', adapted to be secured to a boiler,said casing having an outlet branch at right anglesy toI said extension, said inlet: and, outlet branches being separated by a partition providing an inlet chamber and an outlet chamber, saidcasing and partition each having an Vopening opposite said inlet branch, a one piece removable member insertable axially throughsaid openings and inletbranch and secured in oneof said openr ings, said member having means for closing the other of said openings and having com municating *ductsY at rights vangles to each other connecting the inlet yend of saidremov# able member with the outlet` chamber, ka

fusible 'plugclosing one of said ducts, said casing having. an opening.. communicating with said inlet'chamber, a valve normally Y ing'having` an exteriorly threaded extension i forming anl inlety branchand, adapted to be secured tov a boiler, said casingfhhaving anoutllet branch at right ang-les to said extension,

saidinlet andoutlet,branchesbeing'separated by a partitionproviding an inlet chamber andV an. outlet chamber, said casing; and-partition each having an opening opposite said inlet branch, a one piece removable member insertable axially through said openings and inlet branch and secured in one of said open-l ings, said member having means for closing 

